Contents

Pin Muxing

The am335x processor on the BeagleBone has more internal 'pins' than external pins. The solution is to have each external pin attached to a multiplexer that can be 'muxed' to one of eight internal pins. A nice chart that shows what can connect to where can be found by

These two pdf files show where each of the pins on the P8 and P9 headers can be muxed. The initial muxing is set at boot time using the Device Tree (DT). To change the pin mux we'll get an overlay that works and edit it.